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Finding the Fourth Proportional to 710,425.32, 980,387.70 and 388,140.72

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Solution

The fourth proportional to 710,425.32, 980,387.70 and 388,140.72 is: 535,634.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,425.32 : 980,387.70 = 388,140.72 : x
  2. Step 2: Convert to fraction form
    710,425.32/980,387.70 = 388,140.72/x
  3. Step 3: Cross multiply
    710,425.32x = 980,387.70 × 388,140.72
  4. Step 4: Simplify right side
    710,425.32x = 380,528,387,757.14
  5. Step 5: Solve for x
    x = 380,528,387,757.14/710,425.32
  6. Step 6: Final answer
    x = 535,634.61

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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.