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Finding the Fourth Proportional to 40,875.20, 61,312.80 and 21,159.80

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Solution

The fourth proportional to 40,875.20, 61,312.80 and 21,159.80 is: 31,739.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,875.20 : 61,312.80 = 21,159.80 : x
  2. Step 2: Convert to fraction form
    40,875.20/61,312.80 = 21,159.80/x
  3. Step 3: Cross multiply
    40,875.20x = 61,312.80 × 21,159.80
  4. Step 4: Simplify right side
    40,875.20x = 1,297,366,585.44
  5. Step 5: Solve for x
    x = 1,297,366,585.44/40,875.20
  6. Step 6: Final answer
    x = 31,739.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.