Home / 10,389.40-15,547.65-7,108.90

Finding the Fourth Proportional to 10,389.40, 15,547.65 and 7,108.90

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Solution

The fourth proportional to 10,389.40, 15,547.65 and 7,108.90 is: 10,638.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,389.40 : 15,547.65 = 7,108.90 : x
  2. Step 2: Convert to fraction form
    10,389.40/15,547.65 = 7,108.90/x
  3. Step 3: Cross multiply
    10,389.40x = 15,547.65 × 7,108.90
  4. Step 4: Simplify right side
    10,389.40x = 110,526,689.09
  5. Step 5: Solve for x
    x = 110,526,689.09/10,389.40
  6. Step 6: Final answer
    x = 10,638.41

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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.