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Finding the Fourth Proportional to 96,686.90, 145,139.70 and 74,598.20

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Solution

The fourth proportional to 96,686.90, 145,139.70 and 74,598.20 is: 111,981.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    96,686.90 : 145,139.70 = 74,598.20 : x
  2. Step 2: Convert to fraction form
    96,686.90/145,139.70 = 74,598.20/x
  3. Step 3: Cross multiply
    96,686.90x = 145,139.70 × 74,598.20
  4. Step 4: Simplify right side
    96,686.90x = 10,827,160,368.54
  5. Step 5: Solve for x
    x = 10,827,160,368.54/96,686.90
  6. Step 6: Final answer
    x = 111,981.67

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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.