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Finding the Fourth Proportional to 1,529.70, 2,111.21 and 970.22

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Solution

The fourth proportional to 1,529.70, 2,111.21 and 970.22 is: 1,339.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,529.70 : 2,111.21 = 970.22 : x
  2. Step 2: Convert to fraction form
    1,529.70/2,111.21 = 970.22/x
  3. Step 3: Cross multiply
    1,529.70x = 2,111.21 × 970.22
  4. Step 4: Simplify right side
    1,529.70x = 2,048,338.17
  5. Step 5: Solve for x
    x = 2,048,338.17/1,529.70
  6. Step 6: Final answer
    x = 1,339.05

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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.