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Finding the Fourth Proportional to 1,570.64, 2,167.56 and 907.70

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Solution

The fourth proportional to 1,570.64, 2,167.56 and 907.70 is: 1,252.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.64 : 2,167.56 = 907.70 : x
  2. Step 2: Convert to fraction form
    1,570.64/2,167.56 = 907.70/x
  3. Step 3: Cross multiply
    1,570.64x = 2,167.56 × 907.70
  4. Step 4: Simplify right side
    1,570.64x = 1,967,483.37
  5. Step 5: Solve for x
    x = 1,967,483.37/1,570.64
  6. Step 6: Final answer
    x = 1,252.67

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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.