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Finding the Fourth Proportional to 28,959.42, 39,970.80 and 18,870.42

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Solution

The fourth proportional to 28,959.42, 39,970.80 and 18,870.42 is: 26,045.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,959.42 : 39,970.80 = 18,870.42 : x
  2. Step 2: Convert to fraction form
    28,959.42/39,970.80 = 18,870.42/x
  3. Step 3: Cross multiply
    28,959.42x = 39,970.80 × 18,870.42
  4. Step 4: Simplify right side
    28,959.42x = 754,265,783.74
  5. Step 5: Solve for x
    x = 754,265,783.74/28,959.42
  6. Step 6: Final answer
    x = 26,045.61

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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.