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Finding the Fourth Proportional to 1,210.44, 1,670.45 and 686.45

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Solution

The fourth proportional to 1,210.44, 1,670.45 and 686.45 is: 947.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.44 : 1,670.45 = 686.45 : x
  2. Step 2: Convert to fraction form
    1,210.44/1,670.45 = 686.45/x
  3. Step 3: Cross multiply
    1,210.44x = 1,670.45 × 686.45
  4. Step 4: Simplify right side
    1,210.44x = 1,146,668.62
  5. Step 5: Solve for x
    x = 1,146,668.62/1,210.44
  6. Step 6: Final answer
    x = 947.32

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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.