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Finding the Fourth Proportional to 137,318.40, 205,718.40 and 70,531.20

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Solution

The fourth proportional to 137,318.40, 205,718.40 and 70,531.20 is: 105,663.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,318.40 : 205,718.40 = 70,531.20 : x
  2. Step 2: Convert to fraction form
    137,318.40/205,718.40 = 70,531.20/x
  3. Step 3: Cross multiply
    137,318.40x = 205,718.40 × 70,531.20
  4. Step 4: Simplify right side
    137,318.40x = 14,509,565,614.08
  5. Step 5: Solve for x
    x = 14,509,565,614.08/137,318.40
  6. Step 6: Final answer
    x = 105,663.67

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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.