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Finding the Fourth Proportional to 1,681.48, 2,521.68 and 612.76

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Solution

The fourth proportional to 1,681.48, 2,521.68 and 612.76 is: 918.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.48 : 2,521.68 = 612.76 : x
  2. Step 2: Convert to fraction form
    1,681.48/2,521.68 = 612.76/x
  3. Step 3: Cross multiply
    1,681.48x = 2,521.68 × 612.76
  4. Step 4: Simplify right side
    1,681.48x = 1,545,184.64
  5. Step 5: Solve for x
    x = 1,545,184.64/1,681.48
  6. Step 6: Final answer
    x = 918.94

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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.