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Finding the Fourth Proportional to 56,390.80, 77,740.32 and 39,370.72

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Solution

The fourth proportional to 56,390.80, 77,740.32 and 39,370.72 is: 54,276.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,390.80 : 77,740.32 = 39,370.72 : x
  2. Step 2: Convert to fraction form
    56,390.80/77,740.32 = 39,370.72/x
  3. Step 3: Cross multiply
    56,390.80x = 77,740.32 × 39,370.72
  4. Step 4: Simplify right side
    56,390.80x = 3,060,692,371.43
  5. Step 5: Solve for x
    x = 3,060,692,371.43/56,390.80
  6. Step 6: Final answer
    x = 54,276.45

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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.