Home / 78,780.65-118,178.19-31,384.26

Finding the Fourth Proportional to 78,780.65, 118,178.19 and 31,384.26

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Solution

The fourth proportional to 78,780.65, 118,178.19 and 31,384.26 is: 47,079.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,780.65 : 118,178.19 = 31,384.26 : x
  2. Step 2: Convert to fraction form
    78,780.65/118,178.19 = 31,384.26/x
  3. Step 3: Cross multiply
    78,780.65x = 118,178.19 × 31,384.26
  4. Step 4: Simplify right side
    78,780.65x = 3,708,935,041.29
  5. Step 5: Solve for x
    x = 3,708,935,041.29/78,780.65
  6. Step 6: Final answer
    x = 47,079.26

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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.