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Finding the Fourth Proportional to 1,685.95, 2,528.95 and 646.01

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Solution

The fourth proportional to 1,685.95, 2,528.95 and 646.01 is: 969.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.95 : 2,528.95 = 646.01 : x
  2. Step 2: Convert to fraction form
    1,685.95/2,528.95 = 646.01/x
  3. Step 3: Cross multiply
    1,685.95x = 2,528.95 × 646.01
  4. Step 4: Simplify right side
    1,685.95x = 1,633,715.93
  5. Step 5: Solve for x
    x = 1,633,715.93/1,685.95
  6. Step 6: Final answer
    x = 969.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.