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Finding the Fourth Proportional to 578,421.40, 866,465.70 and 389,464.60

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Solution

The fourth proportional to 578,421.40, 866,465.70 and 389,464.60 is: 583,411.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,421.40 : 866,465.70 = 389,464.60 : x
  2. Step 2: Convert to fraction form
    578,421.40/866,465.70 = 389,464.60/x
  3. Step 3: Cross multiply
    578,421.40x = 866,465.70 × 389,464.60
  4. Step 4: Simplify right side
    578,421.40x = 337,457,717,264.22
  5. Step 5: Solve for x
    x = 337,457,717,264.22/578,421.40
  6. Step 6: Final answer
    x = 583,411.54

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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.