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Finding the Fourth Proportional to 1,135.32, 1,567.48 and 821.12

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Solution

The fourth proportional to 1,135.32, 1,567.48 and 821.12 is: 1,133.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.32 : 1,567.48 = 821.12 : x
  2. Step 2: Convert to fraction form
    1,135.32/1,567.48 = 821.12/x
  3. Step 3: Cross multiply
    1,135.32x = 1,567.48 × 821.12
  4. Step 4: Simplify right side
    1,135.32x = 1,287,089.18
  5. Step 5: Solve for x
    x = 1,287,089.18/1,135.32
  6. Step 6: Final answer
    x = 1,133.68

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Half scale
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Double scale
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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.