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Finding the Fourth Proportional to 1,347.68, 2,021.20 and 578.08

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Solution

The fourth proportional to 1,347.68, 2,021.20 and 578.08 is: 866.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.68 : 2,021.20 = 578.08 : x
  2. Step 2: Convert to fraction form
    1,347.68/2,021.20 = 578.08/x
  3. Step 3: Cross multiply
    1,347.68x = 2,021.20 × 578.08
  4. Step 4: Simplify right side
    1,347.68x = 1,168,415.30
  5. Step 5: Solve for x
    x = 1,168,415.30/1,347.68
  6. Step 6: Final answer
    x = 866.98

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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.