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Finding the Fourth Proportional to 972.80, 1,459.45 and 510.45

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Solution

The fourth proportional to 972.80, 1,459.45 and 510.45 is: 765.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.80 : 1,459.45 = 510.45 : x
  2. Step 2: Convert to fraction form
    972.80/1,459.45 = 510.45/x
  3. Step 3: Cross multiply
    972.80x = 1,459.45 × 510.45
  4. Step 4: Simplify right side
    972.80x = 744,968.96
  5. Step 5: Solve for x
    x = 744,968.96/972.80
  6. Step 6: Final answer
    x = 765.80

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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.