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Finding the Fourth Proportional to 948.87, 1,308.90 and 653.64

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Solution

The fourth proportional to 948.87, 1,308.90 and 653.64 is: 901.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.87 : 1,308.90 = 653.64 : x
  2. Step 2: Convert to fraction form
    948.87/1,308.90 = 653.64/x
  3. Step 3: Cross multiply
    948.87x = 1,308.90 × 653.64
  4. Step 4: Simplify right side
    948.87x = 855,549.40
  5. Step 5: Solve for x
    x = 855,549.40/948.87
  6. Step 6: Final answer
    x = 901.65

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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.