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Finding the Fourth Proportional to 659,612.80, 989,419.20 and 210,330.10

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Solution

The fourth proportional to 659,612.80, 989,419.20 and 210,330.10 is: 315,495.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,612.80 : 989,419.20 = 210,330.10 : x
  2. Step 2: Convert to fraction form
    659,612.80/989,419.20 = 210,330.10/x
  3. Step 3: Cross multiply
    659,612.80x = 989,419.20 × 210,330.10
  4. Step 4: Simplify right side
    659,612.80x = 208,104,639,277.92
  5. Step 5: Solve for x
    x = 208,104,639,277.92/659,612.80
  6. Step 6: Final answer
    x = 315,495.15

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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.