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Finding the Fourth Proportional to 1,570.30, 2,167.40 and 907.55

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Solution

The fourth proportional to 1,570.30, 2,167.40 and 907.55 is: 1,252.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.30 : 2,167.40 = 907.55 : x
  2. Step 2: Convert to fraction form
    1,570.30/2,167.40 = 907.55/x
  3. Step 3: Cross multiply
    1,570.30x = 2,167.40 × 907.55
  4. Step 4: Simplify right side
    1,570.30x = 1,967,023.87
  5. Step 5: Solve for x
    x = 1,967,023.87/1,570.30
  6. Step 6: Final answer
    x = 1,252.64

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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.