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Finding the Fourth Proportional to 144,639.40, 216,959.10 and 74,655.40

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Solution

The fourth proportional to 144,639.40, 216,959.10 and 74,655.40 is: 111,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,639.40 : 216,959.10 = 74,655.40 : x
  2. Step 2: Convert to fraction form
    144,639.40/216,959.10 = 74,655.40/x
  3. Step 3: Cross multiply
    144,639.40x = 216,959.10 × 74,655.40
  4. Step 4: Simplify right side
    144,639.40x = 16,197,168,394.14
  5. Step 5: Solve for x
    x = 16,197,168,394.14/144,639.40
  6. Step 6: Final answer
    x = 111,983.10

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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.