Home / 645,459.88-890,729.69-355,065.18

Finding the Fourth Proportional to 645,459.88, 890,729.69 and 355,065.18

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Solution

The fourth proportional to 645,459.88, 890,729.69 and 355,065.18 is: 489,987.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,459.88 : 890,729.69 = 355,065.18 : x
  2. Step 2: Convert to fraction form
    645,459.88/890,729.69 = 355,065.18/x
  3. Step 3: Cross multiply
    645,459.88x = 890,729.69 × 355,065.18
  4. Step 4: Simplify right side
    645,459.88x = 316,267,097,711.19
  5. Step 5: Solve for x
    x = 316,267,097,711.19/645,459.88
  6. Step 6: Final answer
    x = 489,987.23

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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.