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Finding the Fourth Proportional to 42,058.40, 63,087.60 and 21,279.20

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Solution

The fourth proportional to 42,058.40, 63,087.60 and 21,279.20 is: 31,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,058.40 : 63,087.60 = 21,279.20 : x
  2. Step 2: Convert to fraction form
    42,058.40/63,087.60 = 21,279.20/x
  3. Step 3: Cross multiply
    42,058.40x = 63,087.60 × 21,279.20
  4. Step 4: Simplify right side
    42,058.40x = 1,342,453,657.92
  5. Step 5: Solve for x
    x = 1,342,453,657.92/42,058.40
  6. Step 6: Final answer
    x = 31,918.80

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1.5x scale

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.