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Finding the Fourth Proportional to 405,870.40, 607,639.20 and 248,406.40

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Solution

The fourth proportional to 405,870.40, 607,639.20 and 248,406.40 is: 371,895.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,870.40 : 607,639.20 = 248,406.40 : x
  2. Step 2: Convert to fraction form
    405,870.40/607,639.20 = 248,406.40/x
  3. Step 3: Cross multiply
    405,870.40x = 607,639.20 × 248,406.40
  4. Step 4: Simplify right side
    405,870.40x = 150,941,466,170.88
  5. Step 5: Solve for x
    x = 150,941,466,170.88/405,870.40
  6. Step 6: Final answer
    x = 371,895.72

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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.