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Finding the Fourth Proportional to 977.49, 1,348.86 and 535.40

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Solution

The fourth proportional to 977.49, 1,348.86 and 535.40 is: 738.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.49 : 1,348.86 = 535.40 : x
  2. Step 2: Convert to fraction form
    977.49/1,348.86 = 535.40/x
  3. Step 3: Cross multiply
    977.49x = 1,348.86 × 535.40
  4. Step 4: Simplify right side
    977.49x = 722,172.90
  5. Step 5: Solve for x
    x = 722,172.90/977.49
  6. Step 6: Final answer
    x = 738.80

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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.