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Finding the Fourth Proportional to 977.04, 1,348.45 and 578.67

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Solution

The fourth proportional to 977.04, 1,348.45 and 578.67 is: 798.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.04 : 1,348.45 = 578.67 : x
  2. Step 2: Convert to fraction form
    977.04/1,348.45 = 578.67/x
  3. Step 3: Cross multiply
    977.04x = 1,348.45 × 578.67
  4. Step 4: Simplify right side
    977.04x = 780,307.08
  5. Step 5: Solve for x
    x = 780,307.08/977.04
  6. Step 6: Final answer
    x = 798.64

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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.