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Finding the Fourth Proportional to 491.05, 737.28 and 430.91

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Solution

The fourth proportional to 491.05, 737.28 and 430.91 is: 646.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.05 : 737.28 = 430.91 : x
  2. Step 2: Convert to fraction form
    491.05/737.28 = 430.91/x
  3. Step 3: Cross multiply
    491.05x = 737.28 × 430.91
  4. Step 4: Simplify right side
    491.05x = 317,701.32
  5. Step 5: Solve for x
    x = 317,701.32/491.05
  6. Step 6: Final answer
    x = 646.98

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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.