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Finding the Fourth Proportional to 477.16, 657.72 and 389.00

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Solution

The fourth proportional to 477.16, 657.72 and 389.00 is: 536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.16 : 657.72 = 389.00 : x
  2. Step 2: Convert to fraction form
    477.16/657.72 = 389.00/x
  3. Step 3: Cross multiply
    477.16x = 657.72 × 389.00
  4. Step 4: Simplify right side
    477.16x = 255,854.72
  5. Step 5: Solve for x
    x = 255,854.72/477.16
  6. Step 6: Final answer
    x = 536.21

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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.