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Finding the Fourth Proportional to 1,214.16, 1,675.54 and 690.20

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Solution

The fourth proportional to 1,214.16, 1,675.54 and 690.20 is: 952.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.16 : 1,675.54 = 690.20 : x
  2. Step 2: Convert to fraction form
    1,214.16/1,675.54 = 690.20/x
  3. Step 3: Cross multiply
    1,214.16x = 1,675.54 × 690.20
  4. Step 4: Simplify right side
    1,214.16x = 1,156,457.71
  5. Step 5: Solve for x
    x = 1,156,457.71/1,214.16
  6. Step 6: Final answer
    x = 952.48

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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.