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Finding the Fourth Proportional to 1,510.60, 2,085 and 921.63

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Solution

The fourth proportional to 1,510.60, 2,085 and 921.63 is: 1,272.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,510.60 : 2,085 = 921.63 : x
  2. Step 2: Convert to fraction form
    1,510.60/2,085 = 921.63/x
  3. Step 3: Cross multiply
    1,510.60x = 2,085 × 921.63
  4. Step 4: Simplify right side
    1,510.60x = 1,921,598.55
  5. Step 5: Solve for x
    x = 1,921,598.55/1,510.60
  6. Step 6: Final answer
    x = 1,272.08

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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.