Home / 3,130.10-4,695.15-821.60

Finding the Fourth Proportional to 3,130.10, 4,695.15 and 821.60

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Solution

The fourth proportional to 3,130.10, 4,695.15 and 821.60 is: 1,232.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,130.10 : 4,695.15 = 821.60 : x
  2. Step 2: Convert to fraction form
    3,130.10/4,695.15 = 821.60/x
  3. Step 3: Cross multiply
    3,130.10x = 4,695.15 × 821.60
  4. Step 4: Simplify right side
    3,130.10x = 3,857,511.76
  5. Step 5: Solve for x
    x = 3,857,511.76/3,130.10
  6. Step 6: Final answer
    x = 1,232.39

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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.