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Finding the Fourth Proportional to 280,466.32, 387,044 and 153,139.20

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Solution

The fourth proportional to 280,466.32, 387,044 and 153,139.20 is: 211,332.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,466.32 : 387,044 = 153,139.20 : x
  2. Step 2: Convert to fraction form
    280,466.32/387,044 = 153,139.20/x
  3. Step 3: Cross multiply
    280,466.32x = 387,044 × 153,139.20
  4. Step 4: Simplify right side
    280,466.32x = 59,271,608,524.80
  5. Step 5: Solve for x
    x = 59,271,608,524.80/280,466.32
  6. Step 6: Final answer
    x = 211,332.36

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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.