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Finding the Fourth Proportional to 105,638.25, 145,780.80 and 60,926.25

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Solution

The fourth proportional to 105,638.25, 145,780.80 and 60,926.25 is: 84,078.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,638.25 : 145,780.80 = 60,926.25 : x
  2. Step 2: Convert to fraction form
    105,638.25/145,780.80 = 60,926.25/x
  3. Step 3: Cross multiply
    105,638.25x = 145,780.80 × 60,926.25
  4. Step 4: Simplify right side
    105,638.25x = 8,881,877,466
  5. Step 5: Solve for x
    x = 8,881,877,466/105,638.25
  6. Step 6: Final answer
    x = 84,078.23

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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.