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Finding the Fourth Proportional to 608,409.60, 839,717.57 and 390,890.19

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Solution

The fourth proportional to 608,409.60, 839,717.57 and 390,890.19 is: 539,500.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,409.60 : 839,717.57 = 390,890.19 : x
  2. Step 2: Convert to fraction form
    608,409.60/839,717.57 = 390,890.19/x
  3. Step 3: Cross multiply
    608,409.60x = 839,717.57 × 390,890.19
  4. Step 4: Simplify right side
    608,409.60x = 328,237,360,483.64
  5. Step 5: Solve for x
    x = 328,237,360,483.64/608,409.60
  6. Step 6: Final answer
    x = 539,500.63

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Double scale
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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.