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Finding the Fourth Proportional to 971.12, 1,340.40 and 578.24

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Solution

The fourth proportional to 971.12, 1,340.40 and 578.24 is: 798.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.12 : 1,340.40 = 578.24 : x
  2. Step 2: Convert to fraction form
    971.12/1,340.40 = 578.24/x
  3. Step 3: Cross multiply
    971.12x = 1,340.40 × 578.24
  4. Step 4: Simplify right side
    971.12x = 775,072.90
  5. Step 5: Solve for x
    x = 775,072.90/971.12
  6. Step 6: Final answer
    x = 798.12

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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.