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Finding the Fourth Proportional to 873.40, 1,307.40 and 776.20

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Solution

The fourth proportional to 873.40, 1,307.40 and 776.20 is: 1,161.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.40 : 1,307.40 = 776.20 : x
  2. Step 2: Convert to fraction form
    873.40/1,307.40 = 776.20/x
  3. Step 3: Cross multiply
    873.40x = 1,307.40 × 776.20
  4. Step 4: Simplify right side
    873.40x = 1,014,803.88
  5. Step 5: Solve for x
    x = 1,014,803.88/873.40
  6. Step 6: Final answer
    x = 1,161.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.