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Finding the Fourth Proportional to 28,776.78, 39,718.08 and 19,339.87

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Solution

The fourth proportional to 28,776.78, 39,718.08 and 19,339.87 is: 26,693.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,776.78 : 39,718.08 = 19,339.87 : x
  2. Step 2: Convert to fraction form
    28,776.78/39,718.08 = 19,339.87/x
  3. Step 3: Cross multiply
    28,776.78x = 39,718.08 × 19,339.87
  4. Step 4: Simplify right side
    28,776.78x = 768,142,503.85
  5. Step 5: Solve for x
    x = 768,142,503.85/28,776.78
  6. Step 6: Final answer
    x = 26,693.14

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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.