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Finding the Fourth Proportional to 398,658.32, 550,152.68 and 217,368.72

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Solution

The fourth proportional to 398,658.32, 550,152.68 and 217,368.72 is: 299,971.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,658.32 : 550,152.68 = 217,368.72 : x
  2. Step 2: Convert to fraction form
    398,658.32/550,152.68 = 217,368.72/x
  3. Step 3: Cross multiply
    398,658.32x = 550,152.68 × 217,368.72
  4. Step 4: Simplify right side
    398,658.32x = 119,585,983,856.17
  5. Step 5: Solve for x
    x = 119,585,983,856.17/398,658.32
  6. Step 6: Final answer
    x = 299,971.12

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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.