Home / 390,905,173.53-586,429,845.44-128,604,487.05

Finding the Fourth Proportional to 390,905,173.53, 586,429,845.44 and 128,604,487.05

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Solution

The fourth proportional to 390,905,173.53, 586,429,845.44 and 128,604,487.05 is: 192,930,445.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,905,173.53 : 586,429,845.44 = 128,604,487.05 : x
  2. Step 2: Convert to fraction form
    390,905,173.53/586,429,845.44 = 128,604,487.05/x
  3. Step 3: Cross multiply
    390,905,173.53x = 586,429,845.44 × 128,604,487.05
  4. Step 4: Simplify right side
    390,905,173.53x = 75,417,509,462,978,944
  5. Step 5: Solve for x
    x = 75,417,509,462,978,944/390,905,173.53
  6. Step 6: Final answer
    x = 192,930,445.97

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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.