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Finding the Fourth Proportional to 1,112.66, 1,535.56 and 647.18

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Solution

The fourth proportional to 1,112.66, 1,535.56 and 647.18 is: 893.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.66 : 1,535.56 = 647.18 : x
  2. Step 2: Convert to fraction form
    1,112.66/1,535.56 = 647.18/x
  3. Step 3: Cross multiply
    1,112.66x = 1,535.56 × 647.18
  4. Step 4: Simplify right side
    1,112.66x = 993,783.72
  5. Step 5: Solve for x
    x = 993,783.72/1,112.66
  6. Step 6: Final answer
    x = 893.16

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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.