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Finding the Fourth Proportional to 459,276.80, 688,915.20 and 209,958.80

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Solution

The fourth proportional to 459,276.80, 688,915.20 and 209,958.80 is: 314,938.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,276.80 : 688,915.20 = 209,958.80 : x
  2. Step 2: Convert to fraction form
    459,276.80/688,915.20 = 209,958.80/x
  3. Step 3: Cross multiply
    459,276.80x = 688,915.20 × 209,958.80
  4. Step 4: Simplify right side
    459,276.80x = 144,643,808,693.76
  5. Step 5: Solve for x
    x = 144,643,808,693.76/459,276.80
  6. Step 6: Final answer
    x = 314,938.20

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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.