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Finding the Fourth Proportional to 30,912, 42,658.80 and 18,347.52

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Solution

The fourth proportional to 30,912, 42,658.80 and 18,347.52 is: 25,319.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,912 : 42,658.80 = 18,347.52 : x
  2. Step 2: Convert to fraction form
    30,912/42,658.80 = 18,347.52/x
  3. Step 3: Cross multiply
    30,912x = 42,658.80 × 18,347.52
  4. Step 4: Simplify right side
    30,912x = 782,683,186.18
  5. Step 5: Solve for x
    x = 782,683,186.18/30,912
  6. Step 6: Final answer
    x = 25,319.72

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1.5x scale

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.