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Finding the Fourth Proportional to 28,560, 39,412.94 and 15,987.18

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Solution

The fourth proportional to 28,560, 39,412.94 and 15,987.18 is: 22,062.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,560 : 39,412.94 = 15,987.18 : x
  2. Step 2: Convert to fraction form
    28,560/39,412.94 = 15,987.18/x
  3. Step 3: Cross multiply
    28,560x = 39,412.94 × 15,987.18
  4. Step 4: Simplify right side
    28,560x = 630,101,686.17
  5. Step 5: Solve for x
    x = 630,101,686.17/28,560
  6. Step 6: Final answer
    x = 22,062.38

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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.