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Finding the Fourth Proportional to 656,430.80, 984,646.20 and 390,054.20

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Solution

The fourth proportional to 656,430.80, 984,646.20 and 390,054.20 is: 585,081.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,430.80 : 984,646.20 = 390,054.20 : x
  2. Step 2: Convert to fraction form
    656,430.80/984,646.20 = 390,054.20/x
  3. Step 3: Cross multiply
    656,430.80x = 984,646.20 × 390,054.20
  4. Step 4: Simplify right side
    656,430.80x = 384,065,385,824.04
  5. Step 5: Solve for x
    x = 384,065,385,824.04/656,430.80
  6. Step 6: Final answer
    x = 585,081.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.