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Finding the Fourth Proportional to 907.20, 1,250.60 and 707.81

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Solution

The fourth proportional to 907.20, 1,250.60 and 707.81 is: 975.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.20 : 1,250.60 = 707.81 : x
  2. Step 2: Convert to fraction form
    907.20/1,250.60 = 707.81/x
  3. Step 3: Cross multiply
    907.20x = 1,250.60 × 707.81
  4. Step 4: Simplify right side
    907.20x = 885,184.74
  5. Step 5: Solve for x
    x = 885,184.74/907.20
  6. Step 6: Final answer
    x = 975.73

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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.