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Finding the Fourth Proportional to 1,210.30, 1,670.16 and 686.32

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Solution

The fourth proportional to 1,210.30, 1,670.16 and 686.32 is: 947.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.30 : 1,670.16 = 686.32 : x
  2. Step 2: Convert to fraction form
    1,210.30/1,670.16 = 686.32/x
  3. Step 3: Cross multiply
    1,210.30x = 1,670.16 × 686.32
  4. Step 4: Simplify right side
    1,210.30x = 1,146,264.21
  5. Step 5: Solve for x
    x = 1,146,264.21/1,210.30
  6. Step 6: Final answer
    x = 947.09

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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.