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Finding the Fourth Proportional to 78,484.58, 117,726.87 and 28,566.30

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Solution

The fourth proportional to 78,484.58, 117,726.87 and 28,566.30 is: 42,849.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,484.58 : 117,726.87 = 28,566.30 : x
  2. Step 2: Convert to fraction form
    78,484.58/117,726.87 = 28,566.30/x
  3. Step 3: Cross multiply
    78,484.58x = 117,726.87 × 28,566.30
  4. Step 4: Simplify right side
    78,484.58x = 3,363,020,943.65
  5. Step 5: Solve for x
    x = 3,363,020,943.65/78,484.58
  6. Step 6: Final answer
    x = 42,849.45

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1.5x scale

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.