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Finding the Fourth Proportional to 555.93, 767.48 and 390.29

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Solution

The fourth proportional to 555.93, 767.48 and 390.29 is: 538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.93 : 767.48 = 390.29 : x
  2. Step 2: Convert to fraction form
    555.93/767.48 = 390.29/x
  3. Step 3: Cross multiply
    555.93x = 767.48 × 390.29
  4. Step 4: Simplify right side
    555.93x = 299,533.98
  5. Step 5: Solve for x
    x = 299,533.98/555.93
  6. Step 6: Final answer
    x = 538.80

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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.