Home / 1,385.10-2,077.59-345.11

Finding the Fourth Proportional to 1,385.10, 2,077.59 and 345.11

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Solution

The fourth proportional to 1,385.10, 2,077.59 and 345.11 is: 517.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.10 : 2,077.59 = 345.11 : x
  2. Step 2: Convert to fraction form
    1,385.10/2,077.59 = 345.11/x
  3. Step 3: Cross multiply
    1,385.10x = 2,077.59 × 345.11
  4. Step 4: Simplify right side
    1,385.10x = 716,986.70
  5. Step 5: Solve for x
    x = 716,986.70/1,385.10
  6. Step 6: Final answer
    x = 517.64

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Double scale
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1.5x scale

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.