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Finding the Fourth Proportional to 977.05, 1,347.06 and 778.51

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Solution

The fourth proportional to 977.05, 1,347.06 and 778.51 is: 1,073.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.05 : 1,347.06 = 778.51 : x
  2. Step 2: Convert to fraction form
    977.05/1,347.06 = 778.51/x
  3. Step 3: Cross multiply
    977.05x = 1,347.06 × 778.51
  4. Step 4: Simplify right side
    977.05x = 1,048,699.68
  5. Step 5: Solve for x
    x = 1,048,699.68/977.05
  6. Step 6: Final answer
    x = 1,073.33

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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.