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Finding the Fourth Proportional to 1,547.56, 2,135.49 and 875.40

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Solution

The fourth proportional to 1,547.56, 2,135.49 and 875.40 is: 1,207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.56 : 2,135.49 = 875.40 : x
  2. Step 2: Convert to fraction form
    1,547.56/2,135.49 = 875.40/x
  3. Step 3: Cross multiply
    1,547.56x = 2,135.49 × 875.40
  4. Step 4: Simplify right side
    1,547.56x = 1,869,400.10
  5. Step 5: Solve for x
    x = 1,869,400.10/1,547.56
  6. Step 6: Final answer
    x = 1,207.97

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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.