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Finding the Fourth Proportional to 646.50, 891.72 and 384.60

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Solution

The fourth proportional to 646.50, 891.72 and 384.60 is: 530.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.50 : 891.72 = 384.60 : x
  2. Step 2: Convert to fraction form
    646.50/891.72 = 384.60/x
  3. Step 3: Cross multiply
    646.50x = 891.72 × 384.60
  4. Step 4: Simplify right side
    646.50x = 342,955.51
  5. Step 5: Solve for x
    x = 342,955.51/646.50
  6. Step 6: Final answer
    x = 530.48

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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.