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Finding the Fourth Proportional to 438,813.60, 658,220.40 and 390,890.40

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Solution

The fourth proportional to 438,813.60, 658,220.40 and 390,890.40 is: 586,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,813.60 : 658,220.40 = 390,890.40 : x
  2. Step 2: Convert to fraction form
    438,813.60/658,220.40 = 390,890.40/x
  3. Step 3: Cross multiply
    438,813.60x = 658,220.40 × 390,890.40
  4. Step 4: Simplify right side
    438,813.60x = 257,292,035,444.16
  5. Step 5: Solve for x
    x = 257,292,035,444.16/438,813.60
  6. Step 6: Final answer
    x = 586,335.60

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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.