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Finding the Fourth Proportional to 907.21, 1,252.56 and 608.90

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Solution

The fourth proportional to 907.21, 1,252.56 and 608.90 is: 840.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.21 : 1,252.56 = 608.90 : x
  2. Step 2: Convert to fraction form
    907.21/1,252.56 = 608.90/x
  3. Step 3: Cross multiply
    907.21x = 1,252.56 × 608.90
  4. Step 4: Simplify right side
    907.21x = 762,685.71
  5. Step 5: Solve for x
    x = 762,685.71/907.21
  6. Step 6: Final answer
    x = 840.70

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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.