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Finding the Fourth Proportional to 284,305.14, 392,335.95 and 156,978

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Solution

The fourth proportional to 284,305.14, 392,335.95 and 156,978 is: 216,626.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    284,305.14 : 392,335.95 = 156,978 : x
  2. Step 2: Convert to fraction form
    284,305.14/392,335.95 = 156,978/x
  3. Step 3: Cross multiply
    284,305.14x = 392,335.95 × 156,978
  4. Step 4: Simplify right side
    284,305.14x = 61,588,113,347.77
  5. Step 5: Solve for x
    x = 61,588,113,347.77/284,305.14
  6. Step 6: Final answer
    x = 216,626.80

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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.