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Finding the Fourth Proportional to 78,572.40, 108,426.66 and 42,762.48

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Solution

The fourth proportional to 78,572.40, 108,426.66 and 42,762.48 is: 59,010.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,572.40 : 108,426.66 = 42,762.48 : x
  2. Step 2: Convert to fraction form
    78,572.40/108,426.66 = 42,762.48/x
  3. Step 3: Cross multiply
    78,572.40x = 108,426.66 × 42,762.48
  4. Step 4: Simplify right side
    78,572.40x = 4,636,592,879.72
  5. Step 5: Solve for x
    x = 4,636,592,879.72/78,572.40
  6. Step 6: Final answer
    x = 59,010.45

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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.