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Finding the Fourth Proportional to 907.98, 1,259.07 and 877.20

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Solution

The fourth proportional to 907.98, 1,259.07 and 877.20 is: 1,216.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.98 : 1,259.07 = 877.20 : x
  2. Step 2: Convert to fraction form
    907.98/1,259.07 = 877.20/x
  3. Step 3: Cross multiply
    907.98x = 1,259.07 × 877.20
  4. Step 4: Simplify right side
    907.98x = 1,104,456.20
  5. Step 5: Solve for x
    x = 1,104,456.20/907.98
  6. Step 6: Final answer
    x = 1,216.39

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.