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Finding the Fourth Proportional to 863,605.80, 1,295,019.90 and 390,047.40

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Solution

The fourth proportional to 863,605.80, 1,295,019.90 and 390,047.40 is: 584,895.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    863,605.80 : 1,295,019.90 = 390,047.40 : x
  2. Step 2: Convert to fraction form
    863,605.80/1,295,019.90 = 390,047.40/x
  3. Step 3: Cross multiply
    863,605.80x = 1,295,019.90 × 390,047.40
  4. Step 4: Simplify right side
    863,605.80x = 505,119,144,943.26
  5. Step 5: Solve for x
    x = 505,119,144,943.26/863,605.80
  6. Step 6: Final answer
    x = 584,895.50

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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.