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Finding the Fourth Proportional to 20,547.40, 30,821.10 and 15,363.40

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Solution

The fourth proportional to 20,547.40, 30,821.10 and 15,363.40 is: 23,045.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,547.40 : 30,821.10 = 15,363.40 : x
  2. Step 2: Convert to fraction form
    20,547.40/30,821.10 = 15,363.40/x
  3. Step 3: Cross multiply
    20,547.40x = 30,821.10 × 15,363.40
  4. Step 4: Simplify right side
    20,547.40x = 473,516,887.74
  5. Step 5: Solve for x
    x = 473,516,887.74/20,547.40
  6. Step 6: Final answer
    x = 23,045.10

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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.