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Finding the Fourth Proportional to 98,780.65, 136,315.92 and 56,339.89

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Solution

The fourth proportional to 98,780.65, 136,315.92 and 56,339.89 is: 77,748.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,780.65 : 136,315.92 = 56,339.89 : x
  2. Step 2: Convert to fraction form
    98,780.65/136,315.92 = 56,339.89/x
  3. Step 3: Cross multiply
    98,780.65x = 136,315.92 × 56,339.89
  4. Step 4: Simplify right side
    98,780.65x = 7,680,023,938.05
  5. Step 5: Solve for x
    x = 7,680,023,938.05/98,780.65
  6. Step 6: Final answer
    x = 77,748.26

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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.