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Finding the Fourth Proportional to 78,247.79, 107,981.98 and 42,437.66

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Solution

The fourth proportional to 78,247.79, 107,981.98 and 42,437.66 is: 58,563.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,247.79 : 107,981.98 = 42,437.66 : x
  2. Step 2: Convert to fraction form
    78,247.79/107,981.98 = 42,437.66/x
  3. Step 3: Cross multiply
    78,247.79x = 107,981.98 × 42,437.66
  4. Step 4: Simplify right side
    78,247.79x = 4,582,501,907.36
  5. Step 5: Solve for x
    x = 4,582,501,907.36/78,247.79
  6. Step 6: Final answer
    x = 58,563.98

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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.