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Finding the Fourth Proportional to 81,488.61, 112,454.15 and 45,678.65

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Solution

The fourth proportional to 81,488.61, 112,454.15 and 45,678.65 is: 63,036.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,488.61 : 112,454.15 = 45,678.65 : x
  2. Step 2: Convert to fraction form
    81,488.61/112,454.15 = 45,678.65/x
  3. Step 3: Cross multiply
    81,488.61x = 112,454.15 × 45,678.65
  4. Step 4: Simplify right side
    81,488.61x = 5,136,752,968.23
  5. Step 5: Solve for x
    x = 5,136,752,968.23/81,488.61
  6. Step 6: Final answer
    x = 63,036.45

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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.