Home / 85,884,646.80-128,742,989.40-76,814,720.40

Finding the Fourth Proportional to 85,884,646.80, 128,742,989.40 and 76,814,720.40

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Solution

The fourth proportional to 85,884,646.80, 128,742,989.40 and 76,814,720.40 is: 115,146,968.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,884,646.80 : 128,742,989.40 = 76,814,720.40 : x
  2. Step 2: Convert to fraction form
    85,884,646.80/128,742,989.40 = 76,814,720.40/x
  3. Step 3: Cross multiply
    85,884,646.80x = 128,742,989.40 × 76,814,720.40
  4. Step 4: Simplify right side
    85,884,646.80x = 9,889,356,734,221,164
  5. Step 5: Solve for x
    x = 9,889,356,734,221,164/85,884,646.80
  6. Step 6: Final answer
    x = 115,146,968.67

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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.