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Finding the Fourth Proportional to 1,148.76, 1,720.78 and 777.40

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Solution

The fourth proportional to 1,148.76, 1,720.78 and 777.40 is: 1,164.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.76 : 1,720.78 = 777.40 : x
  2. Step 2: Convert to fraction form
    1,148.76/1,720.78 = 777.40/x
  3. Step 3: Cross multiply
    1,148.76x = 1,720.78 × 777.40
  4. Step 4: Simplify right side
    1,148.76x = 1,337,734.37
  5. Step 5: Solve for x
    x = 1,337,734.37/1,148.76
  6. Step 6: Final answer
    x = 1,164.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.