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Finding the Fourth Proportional to 1,510.87, 2,085.38 and 921.90

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Solution

The fourth proportional to 1,510.87, 2,085.38 and 921.90 is: 1,272.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,510.87 : 2,085.38 = 921.90 : x
  2. Step 2: Convert to fraction form
    1,510.87/2,085.38 = 921.90/x
  3. Step 3: Cross multiply
    1,510.87x = 2,085.38 × 921.90
  4. Step 4: Simplify right side
    1,510.87x = 1,922,506.76
  5. Step 5: Solve for x
    x = 1,922,506.76/1,510.87
  6. Step 6: Final answer
    x = 1,272.45

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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.