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Finding the Fourth Proportional to 975.24, 1,347.40 and 681.80

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Solution

The fourth proportional to 975.24, 1,347.40 and 681.80 is: 941.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.24 : 1,347.40 = 681.80 : x
  2. Step 2: Convert to fraction form
    975.24/1,347.40 = 681.80/x
  3. Step 3: Cross multiply
    975.24x = 1,347.40 × 681.80
  4. Step 4: Simplify right side
    975.24x = 918,657.32
  5. Step 5: Solve for x
    x = 918,657.32/975.24
  6. Step 6: Final answer
    x = 941.98

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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.