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Finding the Fourth Proportional to 135,420.42, 186,877.88 and 74,989.76

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Solution

The fourth proportional to 135,420.42, 186,877.88 and 74,989.76 is: 103,484.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,420.42 : 186,877.88 = 74,989.76 : x
  2. Step 2: Convert to fraction form
    135,420.42/186,877.88 = 74,989.76/x
  3. Step 3: Cross multiply
    135,420.42x = 186,877.88 × 74,989.76
  4. Step 4: Simplify right side
    135,420.42x = 14,013,927,370.51
  5. Step 5: Solve for x
    x = 14,013,927,370.51/135,420.42
  6. Step 6: Final answer
    x = 103,484.60

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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.