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Finding the Fourth Proportional to 920.99, 1,271.00 and 528.08

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Solution

The fourth proportional to 920.99, 1,271.00 and 528.08 is: 728.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.99 : 1,271.00 = 528.08 : x
  2. Step 2: Convert to fraction form
    920.99/1,271.00 = 528.08/x
  3. Step 3: Cross multiply
    920.99x = 1,271.00 × 528.08
  4. Step 4: Simplify right side
    920.99x = 671,190.22
  5. Step 5: Solve for x
    x = 671,190.22/920.99
  6. Step 6: Final answer
    x = 728.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.