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Finding the Fourth Proportional to 1,688.51, 2,532.89 and 455.90

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Solution

The fourth proportional to 1,688.51, 2,532.89 and 455.90 is: 683.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.51 : 2,532.89 = 455.90 : x
  2. Step 2: Convert to fraction form
    1,688.51/2,532.89 = 455.90/x
  3. Step 3: Cross multiply
    1,688.51x = 2,532.89 × 455.90
  4. Step 4: Simplify right side
    1,688.51x = 1,154,748.89
  5. Step 5: Solve for x
    x = 1,154,748.89/1,688.51
  6. Step 6: Final answer
    x = 683.89

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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.