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Finding the Fourth Proportional to 1,547.16, 2,320.74 and 521.16

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Solution

The fourth proportional to 1,547.16, 2,320.74 and 521.16 is: 781.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.16 : 2,320.74 = 521.16 : x
  2. Step 2: Convert to fraction form
    1,547.16/2,320.74 = 521.16/x
  3. Step 3: Cross multiply
    1,547.16x = 2,320.74 × 521.16
  4. Step 4: Simplify right side
    1,547.16x = 1,209,476.86
  5. Step 5: Solve for x
    x = 1,209,476.86/1,547.16
  6. Step 6: Final answer
    x = 781.74

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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.