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Finding the Fourth Proportional to 645,909.12, 891,340.61 and 373,988.88

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Solution

The fourth proportional to 645,909.12, 891,340.61 and 373,988.88 is: 516,096.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,909.12 : 891,340.61 = 373,988.88 : x
  2. Step 2: Convert to fraction form
    645,909.12/891,340.61 = 373,988.88/x
  3. Step 3: Cross multiply
    645,909.12x = 891,340.61 × 373,988.88
  4. Step 4: Simplify right side
    645,909.12x = 333,351,474,562.47
  5. Step 5: Solve for x
    x = 333,351,474,562.47/645,909.12
  6. Step 6: Final answer
    x = 516,096.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.