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Finding the Fourth Proportional to 687,012.84, 948,092.91 and 381,079.25

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Solution

The fourth proportional to 687,012.84, 948,092.91 and 381,079.25 is: 525,897.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,012.84 : 948,092.91 = 381,079.25 : x
  2. Step 2: Convert to fraction form
    687,012.84/948,092.91 = 381,079.25/x
  3. Step 3: Cross multiply
    687,012.84x = 948,092.91 × 381,079.25
  4. Step 4: Simplify right side
    687,012.84x = 361,298,533,167.72
  5. Step 5: Solve for x
    x = 361,298,533,167.72/687,012.84
  6. Step 6: Final answer
    x = 525,897.79

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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.