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Finding the Fourth Proportional to 916.72, 1,375.08 and 368.77

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Solution

The fourth proportional to 916.72, 1,375.08 and 368.77 is: 553.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.72 : 1,375.08 = 368.77 : x
  2. Step 2: Convert to fraction form
    916.72/1,375.08 = 368.77/x
  3. Step 3: Cross multiply
    916.72x = 1,375.08 × 368.77
  4. Step 4: Simplify right side
    916.72x = 507,088.59
  5. Step 5: Solve for x
    x = 507,088.59/916.72
  6. Step 6: Final answer
    x = 553.16

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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.