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Finding the Fourth Proportional to 516,009.40, 774,014.10 and 390,038.20

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Solution

The fourth proportional to 516,009.40, 774,014.10 and 390,038.20 is: 585,057.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,009.40 : 774,014.10 = 390,038.20 : x
  2. Step 2: Convert to fraction form
    516,009.40/774,014.10 = 390,038.20/x
  3. Step 3: Cross multiply
    516,009.40x = 774,014.10 × 390,038.20
  4. Step 4: Simplify right side
    516,009.40x = 301,895,066,338.62
  5. Step 5: Solve for x
    x = 301,895,066,338.62/516,009.40
  6. Step 6: Final answer
    x = 585,057.30

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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.