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Finding the Fourth Proportional to 1,521.95, 2,100.13 and 858.76

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Solution

The fourth proportional to 1,521.95, 2,100.13 and 858.76 is: 1,185.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.95 : 2,100.13 = 858.76 : x
  2. Step 2: Convert to fraction form
    1,521.95/2,100.13 = 858.76/x
  3. Step 3: Cross multiply
    1,521.95x = 2,100.13 × 858.76
  4. Step 4: Simplify right side
    1,521.95x = 1,803,509.01
  5. Step 5: Solve for x
    x = 1,803,509.01/1,521.95
  6. Step 6: Final answer
    x = 1,185.00

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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.