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Finding the Fourth Proportional to 18,731.51, 28,111.09 and 8,870.77

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Solution

The fourth proportional to 18,731.51, 28,111.09 and 8,870.77 is: 13,312.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.51 : 28,111.09 = 8,870.77 : x
  2. Step 2: Convert to fraction form
    18,731.51/28,111.09 = 8,870.77/x
  3. Step 3: Cross multiply
    18,731.51x = 28,111.09 × 8,870.77
  4. Step 4: Simplify right side
    18,731.51x = 249,367,013.84
  5. Step 5: Solve for x
    x = 249,367,013.84/18,731.51
  6. Step 6: Final answer
    x = 13,312.70

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1.5x scale

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.