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Finding the Fourth Proportional to 1,663.47, 2,295.72 and 917.57

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Solution

The fourth proportional to 1,663.47, 2,295.72 and 917.57 is: 1,266.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.47 : 2,295.72 = 917.57 : x
  2. Step 2: Convert to fraction form
    1,663.47/2,295.72 = 917.57/x
  3. Step 3: Cross multiply
    1,663.47x = 2,295.72 × 917.57
  4. Step 4: Simplify right side
    1,663.47x = 2,106,479.21
  5. Step 5: Solve for x
    x = 2,106,479.21/1,663.47
  6. Step 6: Final answer
    x = 1,266.32

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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.