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Finding the Fourth Proportional to 27,031.80, 40,547.70 and 18,721.20

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Solution

The fourth proportional to 27,031.80, 40,547.70 and 18,721.20 is: 28,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,031.80 : 40,547.70 = 18,721.20 : x
  2. Step 2: Convert to fraction form
    27,031.80/40,547.70 = 18,721.20/x
  3. Step 3: Cross multiply
    27,031.80x = 40,547.70 × 18,721.20
  4. Step 4: Simplify right side
    27,031.80x = 759,101,601.24
  5. Step 5: Solve for x
    x = 759,101,601.24/27,031.80
  6. Step 6: Final answer
    x = 28,081.80

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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.