Home / 28,261.76-39,003-15,686.72

Finding the Fourth Proportional to 28,261.76, 39,003 and 15,686.72

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Solution

The fourth proportional to 28,261.76, 39,003 and 15,686.72 is: 21,648.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,261.76 : 39,003 = 15,686.72 : x
  2. Step 2: Convert to fraction form
    28,261.76/39,003 = 15,686.72/x
  3. Step 3: Cross multiply
    28,261.76x = 39,003 × 15,686.72
  4. Step 4: Simplify right side
    28,261.76x = 611,829,140.16
  5. Step 5: Solve for x
    x = 611,829,140.16/28,261.76
  6. Step 6: Final answer
    x = 21,648.66

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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.