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Finding the Fourth Proportional to 278,079.48, 417,136.23 and 78,417.32

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Solution

The fourth proportional to 278,079.48, 417,136.23 and 78,417.32 is: 117,630.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,079.48 : 417,136.23 = 78,417.32 : x
  2. Step 2: Convert to fraction form
    278,079.48/417,136.23 = 78,417.32/x
  3. Step 3: Cross multiply
    278,079.48x = 417,136.23 × 78,417.32
  4. Step 4: Simplify right side
    278,079.48x = 32,710,703,145.82
  5. Step 5: Solve for x
    x = 32,710,703,145.82/278,079.48
  6. Step 6: Final answer
    x = 117,630.77

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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.