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Finding the Fourth Proportional to 1,111.32, 1,533.60 and 613.95

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Solution

The fourth proportional to 1,111.32, 1,533.60 and 613.95 is: 847.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.32 : 1,533.60 = 613.95 : x
  2. Step 2: Convert to fraction form
    1,111.32/1,533.60 = 613.95/x
  3. Step 3: Cross multiply
    1,111.32x = 1,533.60 × 613.95
  4. Step 4: Simplify right side
    1,111.32x = 941,547.97
  5. Step 5: Solve for x
    x = 941,547.97/1,111.32
  6. Step 6: Final answer
    x = 847.23

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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.