Home / 28,700.50-39,607.16-15,780.32

Finding the Fourth Proportional to 28,700.50, 39,607.16 and 15,780.32

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Solution

The fourth proportional to 28,700.50, 39,607.16 and 15,780.32 is: 21,777.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,700.50 : 39,607.16 = 15,780.32 : x
  2. Step 2: Convert to fraction form
    28,700.50/39,607.16 = 15,780.32/x
  3. Step 3: Cross multiply
    28,700.50x = 39,607.16 × 15,780.32
  4. Step 4: Simplify right side
    28,700.50x = 625,013,421.60
  5. Step 5: Solve for x
    x = 625,013,421.60/28,700.50
  6. Step 6: Final answer
    x = 21,777.10

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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.