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Finding the Fourth Proportional to 491.61, 736.80 and 389.10

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Solution

The fourth proportional to 491.61, 736.80 and 389.10 is: 583.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.61 : 736.80 = 389.10 : x
  2. Step 2: Convert to fraction form
    491.61/736.80 = 389.10/x
  3. Step 3: Cross multiply
    491.61x = 736.80 × 389.10
  4. Step 4: Simplify right side
    491.61x = 286,688.88
  5. Step 5: Solve for x
    x = 286,688.88/491.61
  6. Step 6: Final answer
    x = 583.16

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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.