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Finding the Fourth Proportional to 1,570.81, 2,167.70 and 907.66

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Solution

The fourth proportional to 1,570.81, 2,167.70 and 907.66 is: 1,252.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.81 : 2,167.70 = 907.66 : x
  2. Step 2: Convert to fraction form
    1,570.81/2,167.70 = 907.66/x
  3. Step 3: Cross multiply
    1,570.81x = 2,167.70 × 907.66
  4. Step 4: Simplify right side
    1,570.81x = 1,967,534.58
  5. Step 5: Solve for x
    x = 1,967,534.58/1,570.81
  6. Step 6: Final answer
    x = 1,252.56

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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.