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Finding the Fourth Proportional to 72,871.55, 100,587.90 and 42,666.57

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Solution

The fourth proportional to 72,871.55, 100,587.90 and 42,666.57 is: 58,894.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,871.55 : 100,587.90 = 42,666.57 : x
  2. Step 2: Convert to fraction form
    72,871.55/100,587.90 = 42,666.57/x
  3. Step 3: Cross multiply
    72,871.55x = 100,587.90 × 42,666.57
  4. Step 4: Simplify right side
    72,871.55x = 4,291,740,676.50
  5. Step 5: Solve for x
    x = 4,291,740,676.50/72,871.55
  6. Step 6: Final answer
    x = 58,894.60

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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.