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Finding the Fourth Proportional to 907.32, 1,252.27 and 643.08

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Solution

The fourth proportional to 907.32, 1,252.27 and 643.08 is: 887.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.32 : 1,252.27 = 643.08 : x
  2. Step 2: Convert to fraction form
    907.32/1,252.27 = 643.08/x
  3. Step 3: Cross multiply
    907.32x = 1,252.27 × 643.08
  4. Step 4: Simplify right side
    907.32x = 805,309.79
  5. Step 5: Solve for x
    x = 805,309.79/907.32
  6. Step 6: Final answer
    x = 887.57

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Double scale
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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.