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Finding the Fourth Proportional to 1,210.71, 1,669.65 and 790.93

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Solution

The fourth proportional to 1,210.71, 1,669.65 and 790.93 is: 1,090.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.71 : 1,669.65 = 790.93 : x
  2. Step 2: Convert to fraction form
    1,210.71/1,669.65 = 790.93/x
  3. Step 3: Cross multiply
    1,210.71x = 1,669.65 × 790.93
  4. Step 4: Simplify right side
    1,210.71x = 1,320,575.40
  5. Step 5: Solve for x
    x = 1,320,575.40/1,210.71
  6. Step 6: Final answer
    x = 1,090.74

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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.