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Finding the Fourth Proportional to 1,564.79, 2,347.20 and 640.13

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Solution

The fourth proportional to 1,564.79, 2,347.20 and 640.13 is: 960.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.79 : 2,347.20 = 640.13 : x
  2. Step 2: Convert to fraction form
    1,564.79/2,347.20 = 640.13/x
  3. Step 3: Cross multiply
    1,564.79x = 2,347.20 × 640.13
  4. Step 4: Simplify right side
    1,564.79x = 1,502,501.40
  5. Step 5: Solve for x
    x = 1,502,501.40/1,564.79
  6. Step 6: Final answer
    x = 960.20

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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.