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Finding the Fourth Proportional to 957.85, 1,430.28 and 760.64

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Solution

The fourth proportional to 957.85, 1,430.28 and 760.64 is: 1,135.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.85 : 1,430.28 = 760.64 : x
  2. Step 2: Convert to fraction form
    957.85/1,430.28 = 760.64/x
  3. Step 3: Cross multiply
    957.85x = 1,430.28 × 760.64
  4. Step 4: Simplify right side
    957.85x = 1,087,928.18
  5. Step 5: Solve for x
    x = 1,087,928.18/957.85
  6. Step 6: Final answer
    x = 1,135.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.