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Finding the Fourth Proportional to 1,230.75, 1,698.44 and 765

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Solution

The fourth proportional to 1,230.75, 1,698.44 and 765 is: 1,055.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.75 : 1,698.44 = 765 : x
  2. Step 2: Convert to fraction form
    1,230.75/1,698.44 = 765/x
  3. Step 3: Cross multiply
    1,230.75x = 1,698.44 × 765
  4. Step 4: Simplify right side
    1,230.75x = 1,299,302.78
  5. Step 5: Solve for x
    x = 1,299,302.78/1,230.75
  6. Step 6: Final answer
    x = 1,055.70

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Find fourth proportional to 615.38, 849.22 and 382.50
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Double scale
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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.