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Finding the Fourth Proportional to 1,210.15, 1,669.96 and 686.20

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Solution

The fourth proportional to 1,210.15, 1,669.96 and 686.20 is: 946.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.15 : 1,669.96 = 686.20 : x
  2. Step 2: Convert to fraction form
    1,210.15/1,669.96 = 686.20/x
  3. Step 3: Cross multiply
    1,210.15x = 1,669.96 × 686.20
  4. Step 4: Simplify right side
    1,210.15x = 1,145,926.55
  5. Step 5: Solve for x
    x = 1,145,926.55/1,210.15
  6. Step 6: Final answer
    x = 946.93

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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.