Home / 645,069.16-890,140.74-354,665.14

Finding the Fourth Proportional to 645,069.16, 890,140.74 and 354,665.14

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Solution

The fourth proportional to 645,069.16, 890,140.74 and 354,665.14 is: 489,407.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,069.16 : 890,140.74 = 354,665.14 : x
  2. Step 2: Convert to fraction form
    645,069.16/890,140.74 = 354,665.14/x
  3. Step 3: Cross multiply
    645,069.16x = 890,140.74 × 354,665.14
  4. Step 4: Simplify right side
    645,069.16x = 315,701,890,171.80
  5. Step 5: Solve for x
    x = 315,701,890,171.80/645,069.16
  6. Step 6: Final answer
    x = 489,407.82

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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.