Home / 78,365.40-108,143.92-42,555.12

Finding the Fourth Proportional to 78,365.40, 108,143.92 and 42,555.12

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Solution

The fourth proportional to 78,365.40, 108,143.92 and 42,555.12 is: 58,725.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,365.40 : 108,143.92 = 42,555.12 : x
  2. Step 2: Convert to fraction form
    78,365.40/108,143.92 = 42,555.12/x
  3. Step 3: Cross multiply
    78,365.40x = 108,143.92 × 42,555.12
  4. Step 4: Simplify right side
    78,365.40x = 4,602,077,492.87
  5. Step 5: Solve for x
    x = 4,602,077,492.87/78,365.40
  6. Step 6: Final answer
    x = 58,725.89

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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.