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Finding the Fourth Proportional to 318,717.72, 478,111.61 and 105,407.93

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Solution

The fourth proportional to 318,717.72, 478,111.61 and 105,407.93 is: 158,123.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,717.72 : 478,111.61 = 105,407.93 : x
  2. Step 2: Convert to fraction form
    318,717.72/478,111.61 = 105,407.93/x
  3. Step 3: Cross multiply
    318,717.72x = 478,111.61 × 105,407.93
  4. Step 4: Simplify right side
    318,717.72x = 50,396,752,201.47
  5. Step 5: Solve for x
    x = 50,396,752,201.47/318,717.72
  6. Step 6: Final answer
    x = 158,123.47

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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.