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Finding the Fourth Proportional to 589.20, 875.10 and 578.40

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Solution

The fourth proportional to 589.20, 875.10 and 578.40 is: 859.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.20 : 875.10 = 578.40 : x
  2. Step 2: Convert to fraction form
    589.20/875.10 = 578.40/x
  3. Step 3: Cross multiply
    589.20x = 875.10 × 578.40
  4. Step 4: Simplify right side
    589.20x = 506,157.84
  5. Step 5: Solve for x
    x = 506,157.84/589.20
  6. Step 6: Final answer
    x = 859.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.