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Finding the Fourth Proportional to 712,699.32, 983,525.25 and 390,420.87

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Solution

The fourth proportional to 712,699.32, 983,525.25 and 390,420.87 is: 538,780.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,699.32 : 983,525.25 = 390,420.87 : x
  2. Step 2: Convert to fraction form
    712,699.32/983,525.25 = 390,420.87/x
  3. Step 3: Cross multiply
    712,699.32x = 983,525.25 × 390,420.87
  4. Step 4: Simplify right side
    712,699.32x = 383,988,783,771.97
  5. Step 5: Solve for x
    x = 383,988,783,771.97/712,699.32
  6. Step 6: Final answer
    x = 538,780.90

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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.