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Finding the Fourth Proportional to 1,661.61, 2,492.42 and 428.93

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Solution

The fourth proportional to 1,661.61, 2,492.42 and 428.93 is: 643.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.61 : 2,492.42 = 428.93 : x
  2. Step 2: Convert to fraction form
    1,661.61/2,492.42 = 428.93/x
  3. Step 3: Cross multiply
    1,661.61x = 2,492.42 × 428.93
  4. Step 4: Simplify right side
    1,661.61x = 1,069,081.38
  5. Step 5: Solve for x
    x = 1,069,081.38/1,661.61
  6. Step 6: Final answer
    x = 643.40

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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.