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Finding the Fourth Proportional to 386,427.30, 579,640.95 and 342,881.70

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Solution

The fourth proportional to 386,427.30, 579,640.95 and 342,881.70 is: 514,322.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,427.30 : 579,640.95 = 342,881.70 : x
  2. Step 2: Convert to fraction form
    386,427.30/579,640.95 = 342,881.70/x
  3. Step 3: Cross multiply
    386,427.30x = 579,640.95 × 342,881.70
  4. Step 4: Simplify right side
    386,427.30x = 198,748,274,325.62
  5. Step 5: Solve for x
    x = 198,748,274,325.62/386,427.30
  6. Step 6: Final answer
    x = 514,322.55

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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.