Home / 645,455.83-890,724.11-355,061.15

Finding the Fourth Proportional to 645,455.83, 890,724.11 and 355,061.15

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Solution

The fourth proportional to 645,455.83, 890,724.11 and 355,061.15 is: 489,981.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,455.83 : 890,724.11 = 355,061.15 : x
  2. Step 2: Convert to fraction form
    645,455.83/890,724.11 = 355,061.15/x
  3. Step 3: Cross multiply
    645,455.83x = 890,724.11 × 355,061.15
  4. Step 4: Simplify right side
    645,455.83x = 316,261,523,263.36
  5. Step 5: Solve for x
    x = 316,261,523,263.36/645,455.83
  6. Step 6: Final answer
    x = 489,981.67

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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.