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Finding the Fourth Proportional to 556.47, 767.93 and 307.80

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Solution

The fourth proportional to 556.47, 767.93 and 307.80 is: 424.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.47 : 767.93 = 307.80 : x
  2. Step 2: Convert to fraction form
    556.47/767.93 = 307.80/x
  3. Step 3: Cross multiply
    556.47x = 767.93 × 307.80
  4. Step 4: Simplify right side
    556.47x = 236,368.85
  5. Step 5: Solve for x
    x = 236,368.85/556.47
  6. Step 6: Final answer
    x = 424.76

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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.