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Finding the Fourth Proportional to 140,987, 211,480.50 and 42,491

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Solution

The fourth proportional to 140,987, 211,480.50 and 42,491 is: 63,736.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,987 : 211,480.50 = 42,491 : x
  2. Step 2: Convert to fraction form
    140,987/211,480.50 = 42,491/x
  3. Step 3: Cross multiply
    140,987x = 211,480.50 × 42,491
  4. Step 4: Simplify right side
    140,987x = 8,986,017,925.50
  5. Step 5: Solve for x
    x = 8,986,017,925.50/140,987
  6. Step 6: Final answer
    x = 63,736.50

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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.