Home / 1,421.66-1,962.96-1,398.98

Finding the Fourth Proportional to 1,421.66, 1,962.96 and 1,398.98

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Solution

The fourth proportional to 1,421.66, 1,962.96 and 1,398.98 is: 1,931.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.66 : 1,962.96 = 1,398.98 : x
  2. Step 2: Convert to fraction form
    1,421.66/1,962.96 = 1,398.98/x
  3. Step 3: Cross multiply
    1,421.66x = 1,962.96 × 1,398.98
  4. Step 4: Simplify right side
    1,421.66x = 2,746,141.78
  5. Step 5: Solve for x
    x = 2,746,141.78/1,421.66
  6. Step 6: Final answer
    x = 1,931.64

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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.