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Finding the Fourth Proportional to 645,353.79, 890,831.79 and 554,345.43

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Solution

The fourth proportional to 645,353.79, 890,831.79 and 554,345.43 is: 765,205.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,353.79 : 890,831.79 = 554,345.43 : x
  2. Step 2: Convert to fraction form
    645,353.79/890,831.79 = 554,345.43/x
  3. Step 3: Cross multiply
    645,353.79x = 890,831.79 × 554,345.43
  4. Step 4: Simplify right side
    645,353.79x = 493,828,531,685.22
  5. Step 5: Solve for x
    x = 493,828,531,685.22/645,353.79
  6. Step 6: Final answer
    x = 765,205.91

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1.5x scale

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.