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Finding the Fourth Proportional to 977.85, 1,349.40 and 535.74

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Solution

The fourth proportional to 977.85, 1,349.40 and 535.74 is: 739.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.85 : 1,349.40 = 535.74 : x
  2. Step 2: Convert to fraction form
    977.85/1,349.40 = 535.74/x
  3. Step 3: Cross multiply
    977.85x = 1,349.40 × 535.74
  4. Step 4: Simplify right side
    977.85x = 722,924.50
  5. Step 5: Solve for x
    x = 722,924.50/977.85
  6. Step 6: Final answer
    x = 739.30

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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.