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Finding the Fourth Proportional to 443,831.40, 665,639.10 and 128,255.40

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Solution

The fourth proportional to 443,831.40, 665,639.10 and 128,255.40 is: 192,351.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,831.40 : 665,639.10 = 128,255.40 : x
  2. Step 2: Convert to fraction form
    443,831.40/665,639.10 = 128,255.40/x
  3. Step 3: Cross multiply
    443,831.40x = 665,639.10 × 128,255.40
  4. Step 4: Simplify right side
    443,831.40x = 85,371,809,026.14
  5. Step 5: Solve for x
    x = 85,371,809,026.14/443,831.40
  6. Step 6: Final answer
    x = 192,351.89

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1.5x scale

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.