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Finding the Fourth Proportional to 1,210.32, 1,815.71 and 690.91

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Solution

The fourth proportional to 1,210.32, 1,815.71 and 690.91 is: 1,036.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.32 : 1,815.71 = 690.91 : x
  2. Step 2: Convert to fraction form
    1,210.32/1,815.71 = 690.91/x
  3. Step 3: Cross multiply
    1,210.32x = 1,815.71 × 690.91
  4. Step 4: Simplify right side
    1,210.32x = 1,254,484.20
  5. Step 5: Solve for x
    x = 1,254,484.20/1,210.32
  6. Step 6: Final answer
    x = 1,036.49

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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.