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Finding the Fourth Proportional to 1,989.56, 2,984.58 and 528.74

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Solution

The fourth proportional to 1,989.56, 2,984.58 and 528.74 is: 793.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.56 : 2,984.58 = 528.74 : x
  2. Step 2: Convert to fraction form
    1,989.56/2,984.58 = 528.74/x
  3. Step 3: Cross multiply
    1,989.56x = 2,984.58 × 528.74
  4. Step 4: Simplify right side
    1,989.56x = 1,578,066.83
  5. Step 5: Solve for x
    x = 1,578,066.83/1,989.56
  6. Step 6: Final answer
    x = 793.17

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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.