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Finding the Fourth Proportional to 90,390.76, 124,665.30 and 63,621.88

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Solution

The fourth proportional to 90,390.76, 124,665.30 and 63,621.88 is: 87,746.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,390.76 : 124,665.30 = 63,621.88 : x
  2. Step 2: Convert to fraction form
    90,390.76/124,665.30 = 63,621.88/x
  3. Step 3: Cross multiply
    90,390.76x = 124,665.30 × 63,621.88
  4. Step 4: Simplify right side
    90,390.76x = 7,931,440,756.76
  5. Step 5: Solve for x
    x = 7,931,440,756.76/90,390.76
  6. Step 6: Final answer
    x = 87,746.15

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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.