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Finding the Fourth Proportional to 865,404.76, 1,200,368.77 and 842,387.80

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Solution

The fourth proportional to 865,404.76, 1,200,368.77 and 842,387.80 is: 1,168,442.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,404.76 : 1,200,368.77 = 842,387.80 : x
  2. Step 2: Convert to fraction form
    865,404.76/1,200,368.77 = 842,387.80/x
  3. Step 3: Cross multiply
    865,404.76x = 1,200,368.77 × 842,387.80
  4. Step 4: Simplify right side
    865,404.76x = 1,011,176,007,349.01
  5. Step 5: Solve for x
    x = 1,011,176,007,349.01/865,404.76
  6. Step 6: Final answer
    x = 1,168,442.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.