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Finding the Fourth Proportional to 56,407.80, 77,763.78 and 39,387.72

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Solution

The fourth proportional to 56,407.80, 77,763.78 and 39,387.72 is: 54,299.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,407.80 : 77,763.78 = 39,387.72 : x
  2. Step 2: Convert to fraction form
    56,407.80/77,763.78 = 39,387.72/x
  3. Step 3: Cross multiply
    56,407.80x = 77,763.78 × 39,387.72
  4. Step 4: Simplify right side
    56,407.80x = 3,062,937,992.78
  5. Step 5: Solve for x
    x = 3,062,937,992.78/56,407.80
  6. Step 6: Final answer
    x = 54,299.90

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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.