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Finding the Fourth Proportional to 977.42, 1,345.59 and 756.02

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Solution

The fourth proportional to 977.42, 1,345.59 and 756.02 is: 1,040.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.42 : 1,345.59 = 756.02 : x
  2. Step 2: Convert to fraction form
    977.42/1,345.59 = 756.02/x
  3. Step 3: Cross multiply
    977.42x = 1,345.59 × 756.02
  4. Step 4: Simplify right side
    977.42x = 1,017,286.22
  5. Step 5: Solve for x
    x = 1,017,286.22/977.42
  6. Step 6: Final answer
    x = 1,040.79

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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.