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Finding the Fourth Proportional to 86,622.93, 129,638.61 and 72,598.79

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Solution

The fourth proportional to 86,622.93, 129,638.61 and 72,598.79 is: 108,650.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,622.93 : 129,638.61 = 72,598.79 : x
  2. Step 2: Convert to fraction form
    86,622.93/129,638.61 = 72,598.79/x
  3. Step 3: Cross multiply
    86,622.93x = 129,638.61 × 72,598.79
  4. Step 4: Simplify right side
    86,622.93x = 9,411,606,547.38
  5. Step 5: Solve for x
    x = 9,411,606,547.38/86,622.93
  6. Step 6: Final answer
    x = 108,650.29

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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.