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Finding the Fourth Proportional to 390,859,271.60, 586,867,441.80 and 218,679,969.20

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Solution

The fourth proportional to 390,859,271.60, 586,867,441.80 and 218,679,969.20 is: 328,343,635.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,859,271.60 : 586,867,441.80 = 218,679,969.20 : x
  2. Step 2: Convert to fraction form
    390,859,271.60/586,867,441.80 = 218,679,969.20/x
  3. Step 3: Cross multiply
    390,859,271.60x = 586,867,441.80 × 218,679,969.20
  4. Step 4: Simplify right side
    390,859,271.60x = 128,336,154,097,306,768
  5. Step 5: Solve for x
    x = 128,336,154,097,306,768/390,859,271.60
  6. Step 6: Final answer
    x = 328,343,635.22

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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.