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Finding the Fourth Proportional to 278,046.40, 417,094.16 and 78,368.48

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Solution

The fourth proportional to 278,046.40, 417,094.16 and 78,368.48 is: 117,559.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,046.40 : 417,094.16 = 78,368.48 : x
  2. Step 2: Convert to fraction form
    278,046.40/417,094.16 = 78,368.48/x
  3. Step 3: Cross multiply
    278,046.40x = 417,094.16 × 78,368.48
  4. Step 4: Simplify right side
    278,046.40x = 32,687,035,336.08
  5. Step 5: Solve for x
    x = 32,687,035,336.08/278,046.40
  6. Step 6: Final answer
    x = 117,559.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.