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Finding the Fourth Proportional to 78,697.45, 108,602.62 and 42,887.45

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Solution

The fourth proportional to 78,697.45, 108,602.62 and 42,887.45 is: 59,184.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,697.45 : 108,602.62 = 42,887.45 : x
  2. Step 2: Convert to fraction form
    78,697.45/108,602.62 = 42,887.45/x
  3. Step 3: Cross multiply
    78,697.45x = 108,602.62 × 42,887.45
  4. Step 4: Simplify right side
    78,697.45x = 4,657,689,535.20
  5. Step 5: Solve for x
    x = 4,657,689,535.20/78,697.45
  6. Step 6: Final answer
    x = 59,184.76

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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.