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Finding the Third Proportional to 189,440 and 315,688

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Solution

The third proportional to 189,440 and 315,688 is: 526,071.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,440 : 315,688 = 315,688 : x
  2. Step 2: Convert to fraction form
    189,440/315,688 = 315,688/x
  3. Step 3: Cross multiply
    189,440x = 315,688 × 315,688
  4. Step 4: Simplify right side
    189,440x = 99,658,913,344
  5. Step 5: Solve for x
    x = 99,658,913,344/189,440
  6. Step 6: Final answer
    x = 526,071.12

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.