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Finding the Fourth Proportional to 977.04, 1,347.37 and 790.40

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Solution

The fourth proportional to 977.04, 1,347.37 and 790.40 is: 1,089.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.04 : 1,347.37 = 790.40 : x
  2. Step 2: Convert to fraction form
    977.04/1,347.37 = 790.40/x
  3. Step 3: Cross multiply
    977.04x = 1,347.37 × 790.40
  4. Step 4: Simplify right side
    977.04x = 1,064,962.64
  5. Step 5: Solve for x
    x = 1,064,962.64/977.04
  6. Step 6: Final answer
    x = 1,089.99

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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.